There is an article on the murders in the Northumberland Archive website and it mentions that the weapon used was a Winchester Repeating Sporting gun (not a “rifle”).The doctor’s report states that he saw “pellet marks on the victim’s tunic and on exposure saw many small circular wounds”. This and the other injuries he mentions in his report indicates that the weapon used was a shotgun. Also the police “extracted pellets from the wall and more recovered from the floor”. Pellets are what are fired from a 12 bore cartridge.
In Evan Martin’s book “Some Men, Murders and Mysteries of Old Bedlington” there is a short story on the Sun Inn murders and he states the weapon used was a Winchester shotgun.

John Elliot McCutchen’s book “The Hartley Colliery Disaster” refers to John Short and tells us that he was the engine - wright at the colliery and led the first rescue operation. He also gave evidence at the inquest.

I was confused with your comment about someone called JDJ Metcalf being the prominent and well respected breeder of Bedlington Terriers. As you state in your comment on your photo, the character you are referring to is Ned Metcalf.
Jane D J Metcalf was Ned's wife and it would appear that the licence for the Gardeners Arms was in her name, as can be seen on the pub sign in your great photos of the pub.
(I got this information from the 1939 census.)

The hospital was downstream of the Iron Bridge, shown on the plan as “Hospital – Infectious Diseases”. The building was still there in the late 1950’s, possibly early 60’s but I don’t know the year it had last functioned as a hospital. It was constructed of wood and we used to call it “the Fever Hospital”
When the glove factory started up it was located in the hospital building until it moved to the Barrington Colliery Institute. The factory moved to Barrington after the Colliery rows were demolished and the institute closed.

Thanks for posting this interesting newspaper clipping from the Morpeth Herald reporting on the Miners’ Picnic held at Blyth Links in 1864. The person who opened the proceedings was Richard Fynes, who was the author of the book “The Miners of Northumberland and Durham”. The comments below are taken from his book as they provide some background to the reason this meeting would have been arranged. It was held on Monday 5th September 1864, organised by Northumberland Miner’s Mutual Confident Association (The name of the union). The date of the meeting is significant as the union had only just been established a few months before the meeting and this was probably the main reason for the meeting. This was the first time that the Northumberland miners had their own independent union and the key person in the establishment of the union was Thomas Burt who was at that time a “hewer” at Choppington Colliery and was their union representative. He was later General Secretary of the union, then MP for Morpeth. (Burt Hall, now part of Northumbria University is named after him.)
Fynes' book is mainly about two major concerns affecting the miners at that time.
The first was the unbelievably harsh conditions of employment – among other things, the owners could sack and evict at will. The other was safety. In the mid 1800’s, 1000 lives a year were being lost in colliery accidents mostly due to methane explosions. There is a reference in the article to a “candle and powder fund”. This was a bill introduced to government to prevent the use of candles and gunpower in fiery collieries. It was not passed. The 1862 Hartley Colliery Disaster that resulted in the death of 204 men and boys would have been still fresh in everyone’s mind and Hartley Colliery was only a few miles from Blyth Links. Due mainly to the pressure from the unions, the law was changed through various Acts of Parliament and most of the demands made by the unions was met.
The miners unions were also fighting for political rights. In 1864, when this meeting was held, to be entitled to vote, one had to own property so miners had no right to vote. This was changed in 1867 to allow those who rented property to vote. In Bedlington and other collieries in the Shire, because miners’ accommodation was free, they did not pay rent, therefore they were not entitled to vote. Fynes’ book describes how Dr Trotter (and others) fought against this interpretation of the law on behalf of the Bedlington miners to have this ruling changed - another reason why the people of Bedlington thought so highly of Dr Trotter that his monument was paid for by public subscription. (It used to have a prominent position in the town, now relegated to the verge!)
I recommend Fynes’ book for anyone interested in the social and industrial history of the area - it's available on Google Books.

If you are a member of Ancestry.com you will find quite a bit information on James Bonner Archbold. He appears in the Archbold – Dodd family tree. It shows where he lived with his sister Alice A Archbold and other family members in the 1891 and 1901 census. You appear to be more interested in his army service and the records below are copied from the Archbold – Todd tree.This information may not be correct but it looks pretty convincing.
UK, Royal Hospital Chelsea Pensioner Soldier Service Records, 1760-1920
Name James Bonner Archbold
Age 18
Birth Date abt 1886
Birth Place Bedlington Northumberland
Service Start Year 1904
Regiment Gordon Highlanders
Regimental Number 9551
Attestation Paper Yes
Global, Find A Grave Index for Burials at Sea and other Select Burial Locations, 1300s-Current
Name Pvt James Archbold
Death Date 26 May 1915
Cemetery Ypres (Menin Gate) Memorial
Burial or Cremation Place Ypres (Ieper), Arrondissement Ieper, West Flanders (West-Vlaanderen), Belgium
Has Bio? N
URL http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=10868064&ref=acom
The Menin Gate is a mausoleum. It pays tribute to those servicemen whose bodies were never recovered. The internal walls are engraved with the names of those who have no known grave

The attached 1860 map shows the Netherton Waggonway that connected Netherton Colliery to the main railway line at Barrington.
One could still walk along the section between Netherton Colliery and the Choppington Road in the 1950’s.

The same seam often had a different name at another colliery,
e.g The Beaumont seam at the Doctor Pit (Bedlington D) was called the Harvey seam at the Aad Pit (Bedlington A).
On page 15 of the report, this is clarified with the best piece of technical jargon I’ve read in ages -
“Seam nomenclature suffers considerably from homonyms and synonyms, arising both from mis-correlation and from the plethora of local names introduced by private colliery companies.”
To prevent the confusion that can arise using the names of seams the NCB assigned letters to the seams, The Harvey is N, The Plessey is M etc. The report makes use of the letters in the report.

It was a surprise to find out that, according to the comment below taken from the report, there are records of coal being mined in this area going back almost 800 years.
"The Moorland Seam is named from Bedlington Moor Land, near the present Bedlington Station, where the coal was mined at least as early as the 18th century. One of the earliest records of local mining in England is near Blyth, where, in 1236, the Moorland Seam was worked along and near its outcrop westwards through Cowpen to Bebside.”

This is not Bedlington Station Brickworks and but is almost certainly the Bedlington Brickworks. The Bedlington skyline can be seen in the background and the row of houses at the back of the brickworks is probably South Row.
The Brickworks at Bedlington Station were known as the Barrington Brickworks and in the attached photo you can see the Barrington Brickworks in the 1960’s with the Bedlington “A” pit in the background. (The “Aad” Pit). The discard dump at the extreme right of the photo is now Gallagher Park.
The other photo shows the Barrington Brickworks in 1894 after a boiler explosion demolished the works.

At the Doctor Pit on Sunday August 10th 1952 the chimney that was part of the steam plant that was used to drive the John Pit winder was demolished in a controlled explosion. The steam winder had been replaced by one driven by electricity so the chimney was no longer needed.
It was quite a spectacle for all of us as it could be seen from most parts of the town. The small chimney at the back was part of the brickworks and Telephone Row is the row nearest the pit.
This part of the town has changed quite a lot in the last 65 years.

According to the Durham Mining Museum web site, 97 miners were killed in mining accidents at the Choppington A and B collieries from the time they opened in the 1860’s to 1965, the year the two pits closed. An average of 1 fatality per year!
Two of these fatalities were caused by methane explosions.
The first occurred on the 13th Dec 1945 and Henry Smith, a coal filler aged 42 died as a result of his injuries on 29th December 1945.
The second was on 15th October 1948 and James Gibbons Prime, a Deputy aged 34 was killed in this explosion.